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I would say you have more that one code fault and they just used a cheap scan tool. You need an auto electrician with a pro grade scan tool computer. That is the only thing that can diagnose the engine speed sensor.
What the P0304 code means. The P0304 code will be seen in cars where the ECU has detected that cylinder 4 is not firing properly. The ECU monitors the operation of all cylinders to ensure they are all firing on time, so when one misfires repeatedly, a Check Engine Light is set.
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P0304 is engine misfire #4 cylinder Several things can cause a misfire #1 electrical which you have covered #2 Mechanical Test engine compression is should be around 150 cranking and 120 running . internal valve train components can cause bad compression and the valves then self. #3 fuel injector can be the cause suggest swapping with a know good cylinder and see if misfire follows injector.
IT could be something such as a loose plug wire.The best advise I can give you is to take your jeep to your local auto parts store and have them pull the codes out of your on board computer.This will give you an area that you can concentrate on to make the necessary repairs to get your check engine light to go out.
P0304 indicates misfire in the cylinders.. A misfire can be triggered by several situations. inadequate fuel,
ignition misfire, insufficient air flow, too much fuel, incomplete
compression... If you look at freeze frame data with a scanner you can
see what the conditions were when the code was set, this will
really help to pinpoint the problem.
A P0304 OBD2 code is "cylinder #4 misfire detected". The first place to start is your spark plugs. 1. Check condition and for wear. 2. check the spark plug wires or coil packs(depending on which you have).
A p0304 is a cylinder misfire on number 4 cylinder. Possible causes are faulty spark plug wire, bad spark plug, or faulty ignition coil. Depending on how many miles are on the vehicle, you may just need a simple tune up.
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